Security attachment



FIG. 1 is a top front perspective view of a security attachment showing the claimed design;

FIG. 2 is a rear view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a top side view thereof;

FIG. 5 is a bottom side view thereof;

FIG. 6 is a left view thereof; and,

FIG. 7 is a right view thereof.

The broken lines in the figures show portions of the security attachment or environment that form no part of the claimed design. 

CLAIM The ornamental design for a security attachment, as shown and described. 